3b. Collar not hairy 



4a. Ligule minute, not more than .2 mm. long 



4b. Ligule .4 to .8 mm. long 



217. Muhlenbcrgia schrcberi— Nimblewill 



Leaves rolled in bud-shoot; sheath somewhat flattened, smooth, split 

 with overlapping hyaline margins; auricles absent; collar broad, hairy 

 on margins; ligule membranous, .4 to .8 mm. long, truncate to rounded; 

 blade to 7 mm. wide, rough above and below, margins rough and hyaline. 

 Inflorescence— numerous slender panicles. New Hampshire south. 

 Lawns, pastures and waste places. 



5a. Blade short hairy above and below 



218. Microstegium vimineum var. imberbe — Basketgrass 



Leaves rolled in bud-shoot; sheath round, smooth, hairy at top, split 

 with one overlapping margin hairy and one hyaline; auricles absent; 

 collar narrow, hairy on margins; ligule membranous, about .2 mm long 

 truncate, very short ciliate; blade 3 to 10 mm. wide (mostly to about 5 

 mm ) short hairy above and below, margins smooth to slightly rough. 

 Inflorescence— 1 to 6 terminal spike-like branches. Southeastern Penn- 

 sylvania south. Shaded banks and roadsides. Infrequent. 



5b. Blade not hairy 



219. Sporobolus clandestinus— Scratch Dropseed 



Leaves folded in bud-shoot; sheath round, smooth, split with overlap- 

 ping hyaline margins; auricles absent; collar narrow to medium broad, 

 hairy; ligule membranous, minute; blade to 5 mm. wide, smooth to 

 sliehtly rough above, smooth and glossy below, margins smooth to slight- 

 ly rough. Inflorescence-* narrow, contracted panicle. Connecticut 

 south. Sandy fields. 



6a. Plant with short stolons 



220. Agrostis tenuis — Colonial Bent 



Leaves rolled in bud-shoot; sheath round, smooth, split with overlap- 

 ping hyaline margins; auricles absent; collar broad, may be divided and 

 hairy on margins; ligule membranous, to 1 mm. long, truncate; blade 3 to 

 5 mm wide, smooth to rough above and below, margins rough and hya- 

 line. Inflorescence-zn open delicate panicle. Common throughout. 

 Pastures, lawns and waste places. 



6b. Plant without stolons 



7a. Widest blades 8 to 10 mm. wide (rarely to only 7 mm.) 8 



7b. Widest blades to 6 mm., rarely more 9 



• 63 



